Winding for electrical apparatus



Aug 5 1924. 1,503,977

L. H. BURNHAM WINDING F02 ELECTRICAL APPARATUS Filed Sent. 26, 1921Inventor: Locke H.Bur-nhar n,

by QM H I s Attorney.

Patented Aug. 5, 1924.

LOCKE H. BURNHAM, OF PITTSFIELD, MASSACHUSE'ET" PATENT OFFICE.

ASSIGNOR TO GENERAL ELECTRIC COMPANY, .[L CORP RA ON 0L NEW YORK.

WINDING Application filed September 26, 1921.

To all whom it may concern Be it known that I, LOCKE H. BURNHAM, acitizen of the United States, residing at Pittsfield, in the county ofBerkshire, State of Massachusetts, have invented certain new and usefulImprovements in l/Vindings for Electrical Apparatus, of which the following is a specification.

My invention relates to windings for electrical apparatus and moreparticularly to an improved construction and arrangement of parts forsupporting or securing such windings in position.

One object of the invention is to provide an improved constructionwhereby an electrical conductor or winding may be secured in position soas to prevent sagging or displacement as a result of its weight orbecause of mechanical stresses due to magnetic influences.

One embodiment of the invention is illustrated in the accompanyingdrawing which shows a primary winding of a transformer with its endcoils supported in accordance with the invention, the secondary windingand a portion of the tank being omitted to reveal details ofconstruction.

As shown in the drawing, the primary winding or coil of a transformer iswound on the winding leg of the core 2, and both are housed in a tank 3,the secondary winding of the transformer and the cover and a portion ofthe tank wall being omitted in order to reveal the construction andarrangement whereby the primary winding is secured in position on thecore. The primary winding 1 is shown as composed of a plurality ofstrands wound in parallel in the form of a bundle on'the winding leg ofthe core 2. The two ends of this bundle of strands extend above the topface of the core to convenient points where connections may be madeleading to outside apparatus. A short distance above the top face of thecore 2, a number of the strands of the conductor 1 are bent outwardlyand, in the particular arrangement shown in the drawing, preferably at aright angle from their original direction, then back upon themselves,and finally along their original path. In the case of a conductor orwinding composed of ELECTRICAL AFPPARATUS.

Serial No. 563.247.

the draw: be bent and separated from the others as described. Bybending, folding or distorting the strands or a portion of them in thismanner, a projection or lug 4 is provided which has the form of aflattened loop projccting from one side of the conductor. A

of suitable insulating a sufii=ient number of strands as shown in g,only a part of the strands need block or support 4), material such aswood, is inserted under the lug Jr and fitted between this lug and thetop face of the core 2 to prevent any sagging or displacement of theconductor 1 which might otherwise occur as a result of its weight orbecause of mechanical stresses due to magnetic action between the turnsof the conductor and the core or other conductors.

In order to give the lug 4 additional strength and rigidity and toprevent its opening under stress, the sections of the strands which arebent or deformed to form the lug are preferably stripped of insulationand finally united by soldering them together into a strong rigid unitprojecting from the face or edge of the conductor. The strands of theconductor may then be bound together close to the lug by winding themwith suitable insulating material 6.

This construction and arrangement, one particular form of which has beendescribed in detail, provides a simple and economical support for theconductor and the block or support 5 may be made thin enough so as notto interfere appreciably with the circulation of air or oil which may beused for cooling purposes. Neither is it necessary that the conductivityand resistance characteristics of the coil be impaired in any way, as inproviding the form of lug which has been described, the cross section ofthe conductor is increased rather than diininished.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is

1. A transformer including a core having a winding leg, a windingsurrounding said winding leg and having a straight section extendingalong one face thereof, the straight section of the winding beingdeformed to provide a projection at an angle to the direction of saidstraight winding section, and means engaging said projection to preventdisplacement of said straight winding section.

2. A transforntier including a core having a Winding leg a Windingincluding a plurality of parallel strands surrounding said Winding legand having a straight section extending along one face thereof, aportion of said strands being bent away from and then back into thedirection of said straight in Winding section to provide a projection atan angle to the direction thereof and means engaging said projection toprevent displacement of said straight Winding section.

In witness whereof, I have hereunto set 15 my hand this 23rd day ofSept, 1921.

LOGKE H. BURNHAM.

